Release 2.6.0 needed for unreleased changes

[ChrisRackauckas-Claude]

Summary

There are 12 commits since version 2.5.4 was released to PyPI that have not been published. These include significant changes that warrant a new release.

Changes since 2.5.4

• Make jill an optional dependency with lazy import (PR Make jill an optional dependency with lazy import #162) - Important fix for users without jill installed
• Drop Python 3.8/3.9 support, require Python 3.10+
• Update juliacall requirement to >=0.9.28
• Add Python 3.14 support
• CI improvements

Proposed Action

Bump version to 2.6.0 and publish to PyPI.

The version change is simply in setup.py:

version='2.6.0',

cc @ChrisRackauckas

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